Home / 13,389.91-18,478.23-7,421.68

Finding the Fourth Proportional to 13,389.91, 18,478.23 and 7,421.68

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Solution

The fourth proportional to 13,389.91, 18,478.23 and 7,421.68 is: 10,242.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.91 : 18,478.23 = 7,421.68 : x
  2. Step 2: Convert to fraction form
    13,389.91/18,478.23 = 7,421.68/x
  3. Step 3: Cross multiply
    13,389.91x = 18,478.23 × 7,421.68
  4. Step 4: Simplify right side
    13,389.91x = 137,139,510.03
  5. Step 5: Solve for x
    x = 137,139,510.03/13,389.91
  6. Step 6: Final answer
    x = 10,242.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.